aimless

Synonyms: accidental any which way bits-and-pieces blind capricious careless casual chance desultory directionless drifting erratic fanciful fickle fits and starts flighty fortuitous frivolous goalless haphazard heedless hit-or-miss indecisive indiscriminate irresolute objectless pointless purposeless random shiftless stray thoughtless unavailing undirected unguided unplanned unpredictable vagrant wandering wanton wayward

Antonyms: determined directed goal-oriented motivated pointed purposeful resolute